Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Employees process customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A packaged customer's orders travels along a conveyor belt at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A packaged customer's orders travels along a conveyor belt at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc., in Ridgmont, U.K. on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc., in Ridgmont, U.K. on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A logo sits on a wall outside the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc., in Ridgmont U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A logo sits on a wall outside the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc., in Ridgmont U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A logo sits on a wall outside the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

A logo sits on a wall outside the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee process customers' goods ahead of delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee process customers' goods ahead of delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee selects goods from storage units ahead of packaging for delivery at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes a customer's order at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes a customer's order at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

An employee processes customer orders at the Amazon.co.uk Marston Gate 'Fulfillment Center' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Packaged customer orders await delivery from the Amazon.co.uk Marston Gate 'Fulfillment Center'' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Packaged customer orders await delivery from the Amazon.co.uk Marston Gate 'Fulfillment Center'' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Packages sit in regional delivery dividers ahead of distribution at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images

Packages sit in regional delivery dividers ahead of distribution at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, U.K., on Monday, Dec. 3, 2012. U.K. consumer confidence unexpectedly increased to an 18-month high in November as Britons become more optimistic about the economy and their finances, GfK NOP Ltd. said. Photographer: Simon Dawson/Bloomberg via Getty Images